2. Autoimmune disease: Patients with a history of inflammatory bowel disease, including ulcerative colitis and Crohn's Disease, are excluded from this study, as are patients with a history of symptomatic disease (eg rheumatoid arthritis, systemic progressive sclerosis [scleroderma], systemic lupus erythematosus, autoimmune vasculitis [eg Wegener's Granulomatosis]); motor neuropathy considered of autoimmune origin (eg Guillain-Barre Syndrome and Myasthenia Gravis).